I'd really prefer to use anhydrous IPA , because the alternative , hexane/white gas/(basically gasoline) will require more fabrication even if the silicone will survive it.....the safety issues are much more important......every single thing will require full-on inert atmosphere.....

Isopropanol , and even kerosene , is pretty tame on the fire scale , but if I use hexane/heptane/gasoline , we are definitely into the 2nd-to-top category of safety......the top category being 'ethers'....